A Batman TV series has always been a no-brainer, but since networks have no brains, it hasn't happened. It would even be workable under the asinine "no-tights" rule that WB (and now CW) lives by. If he can't be in costume, fine--a series about his training years will work just fine. It's the perfect formula. He lives in different parts of the world at different times, collecting the skills he'll use to be Batman. The amount of potential here is astronomical, and has the capacity to appeal to a ridiculously broad audience. Maybe you've got a season set in europe and a season set in Japan, and so on. Episodes about the martial arts, about criminology--hell, you could have episodes where Bruce trains under professional drivers. The field is wide open.

Similarly, a Nightwing television show is also ideal. A young lead coming of age in a new city, making a name for himself out from under Batman's shadow, and with enough money to fill a garage lair with all the coolest toys in the world. Hell, give him a mask and stick a blue bird silhouette on a leather jacket, and you've even satisfied that (as I said, asinine) "no-tights" rule--and with better results than the awful Justice League matching hoodies crap.